I have the following setup:

[phil@thinkpad ~]$ lsblk 
sda      8:0    0 238,5G  0 disk 
├─sda1   8:1    0  52,3G  0 part 
├─sda2   8:2    0 111,8G  0 part /home
├─sda3   8:3    0   954M  0 part [SWAP]
└─sda4   8:4    0    50G  0 part /
sr0     11:0    1  1024M  0 rom 

where :

sda1 : root partition of ubuntu
sda2 : home partition of ubuntu & arch
sda3 : swap partition of ubuntu & arch
sda4 : root partition of arch

what i want to achieve : delete the ubuntu root partition (sda1)

what is my problem / fear : when i boot up, GRUB is displayed to choose from either arch or ubuntu. This is the grub installation from ubuntu, so if i delete the ubuntu root partition (sda1), the grub installation is also gone, right?

-> How can I overwrite the (ubuntu) grub installation with the other (arch) grub installation?

Thanks in advance!


If you delete the Ubuntu root, the bootloader will still be in MBR of the harddrive, but probably will only produce errors, because it invokes files from /boot on the partition from which it was installed.

I would suggest you boot into Arch, delete the Ubuntu partition and install grub anew via

sudo grub-install /dev/sda 
sudo grub-mkconfig -o /boot/grub/grub.cfg

The first command installs the first stage of the bootloader into the MBR and the second will create an appropriate config-file derived from /etc/default/grub and /etc/grub.d/

For further info on how to install Grub under ArchLinux see Archwiki:Grub

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In addition to nephente's answer I suggest as a general decision to create a small partition (50 MiB) which is used for Grub (or whatever) only.

Your Linux installations get configured so that they don't touch the MBR but their /boot partition (which may be / as in your case) only.

The result is a two-stage boot loader: The first one "cannot" break. And if one of the stage 2 loaders breaks then you can still boot the other system.

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